A clause dependent upon the principal clause may itself be followed by a clause dependent upon itself (a sub-dependent clause).

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οἱ δ' ἔλεγον (principal clause) ὅτι περὶ σπονδῶν ἥκοιεν ἄνδρες (dependent clause) οἵτινες ἱκανοὶ ἔσονται . . . ἀπαγγεῖλαι (sub-dependent clause) and they said that they had come with regard to a truce and were men who were competent to . . . reportX.A. 2.3.4.